Clamp for concrete-forms.



A. H. SYMONS.,

CLAMP FOR CONCRETE FORMS.

APPLICATION FILED rnnkw, 1011.

Patented Mar. 12, 1912.

1N VENIOII. Ari/var h. Symons ARTHUR H. SYMONS, OF KANSAS CITY, KANSAS.

CLAMP FOR CONCRETE-FORMS.

To all whom it may concern:

Be it known that I, An'rnnn II. SYMONS, a citizen of the United States, residing at Kansas City, in the county of Wyandottc and State of Kansas, have invented certain new and useful Improvements in Clamps for Concrete-Forms; and I'do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a partof this specification.

My invention relates to a clamp for concrete forms and more particularly to a device for supporting and holding together a form for molding girders in the construction of a concrete building.

It is the principal object of my invention to provide a device of this character which will act as a hanger as well a clamp and will serve to support the girder form, so that the usual intermediate and temporary supports for such forms need not be used. In accomplishing this object I have provided the improved details of structure which will presently be fully described and are illus trated in the accompanying drawings, wherein.:-

Figure I is a perspective view of a clamp constructed according to my invention; Fig. II is a perspective view of a girder form equipped with one of the clamps. Fig. III is a detail view of a tightening tool used with the clamp.

Referring more in detail to the parts 1 designates hanger members which are preferably formed of stiff strap metal and are provided at their upper ends with inturned ears 2, the latter being preferably formed of cast metal and riveted to the ends of the hangers. The lower ends of the hanger members are provided with apertures 3 for receiving the pins 4.

5 designates a base bar which is referably formed of two pieces 6,'of sti strap metal, spaced at their central portion by a bar 7 to provide the end slots 8, and having registering apertures 6 in their free ends. The bar 7 is preferably slightly less in I length than the width of an ordinary girder form, so that when the device is in use the hanger bars 1 may project through the end .slots 8 and be tightened against the form,

Specification of Letters Patent.

Application filed February 18, 1911. Serial No. 609,330.

Patented Mar. 12, 1912.

without being limited by the spacer. Pivotally connected with the hanger bars, near their upper ends are the levers9cb'fiiprising the bell cranked bars 10 which overlie the hanger bars and are connected therewith by the pins 11. Pivotally connected with the levers 9, near their connectionwith the hanger bars, by the pins 13, are the arms 14 which are adapted for-projection between the base members (3 and are provided with the apertures 15.

l6 designates yokes which are pivotally connected with the arms 14 by means of pins 17 which extend through the yoke arms and through apertures 15 in the lever arms, each of the yokes being constructed to provide a space 18 through which the ends of the base 5 may move freely under certain conditions,

Under other conditions, the heads 19 of said yokes may be turned to bring their edges into clamping contact with the lower edges of the base members, so that the yokes will hold against the arms to enable the clamp to be set, as will presently be described.

20 designates bolts which extend through the yoke arms in position to be engaged by the upper ed e of the base 5 and provide clamping sur aces for the upper edge of the base, so that the holding action may take place.

21 designates a girder form, which is supported in its proper position by cross brac ets 22 on pillars 22, so that such side members may support a substantial weight, such cross brackets being preferably nailed to the wooden form within which the pillar is cast. In the upper edge of the top boards of the girder form are notches 23, which are adapted for receiving the clamp ears 2, as illustrated in Fig. II; there being a desired number of said notches throughout the length of the girder for accommodating any suflicient number of clamps to properly support the girder form and the material which is poured thereinto.

24 designates a tool for tightening the base bar against the form, which comprises the fiat handle part having a cam head 25 and laterally projecting pins 26.

In using my device, the girder form is' fixed to the columns and the clamps hung from the upper forum members, as illustrated in Fig. II. To set the clamps, it is preferable to first suspend the hanger bars from the form notcl es and move the base bar into position thereover, the pins 4 being projected through apertures in thelower ends of'the hanger bars when the base has been moved tightly. against the bottom of the form, so

as to hold the parts together and support the base. The,hangerbars are then moved close again atthe sides of the form and plns 4' projected through apertures 6 in he ends of the base, so as to hold the hanger bars in place. The yokes 16 are thenfitted over-the ends of the base and inwardly to aboutthe angle shown, so that the edge of the yoke head will bite against the under edge of the base. When the parts are so arranged,- the levers 9 will be-in their. released position (dotted lines Fig. I). When it is desiredto close the form for pouring, the pin 26 of the lever 24 is placed in one of the apertures 23in the hanger bars 1 and the cam head of the lever moved against the bottom .close contact with the bottomof theform and a pull exerted on the hanger. VVhe'nnuniber of clamps of this character, the form of the base bar so'thabthe bar is moved into theparts have been so tightened, a pin 4 is placed in one oft-he apertures 3 to support the base 1n its. tightened position. "The levers 9 are then lowered to their clamping posit-ion, thereby exerting a leverage on the angerbars, Which tends to move same inwardly into close contact with the form sides. With a girder form provided with a may be clos'ed tightly throughout its length to form a compact, close structure, so that when the side members of the former, areproperly "secured to the columns th'e form may be supportedwithout the aid of the usual temporary columns, thereby etl'ect-ing a saving of labor and material in the erec- ..t-1on 'o-f such structure. --It is apparent that a number'of these clamps will be required {for the construction of each form, but as the operationand arrangement of the clamps 5 is identical, I have illustrated but one, in the figure. illustratingv the clamp in combination with a form. To remove the girder form,

, the levers9- are released and the pins 4 4J removed to enable the clamp members to spread so that theymay be removed from the form; The form itself may then be taken down'and may be used again in a dif v ferent place.

.It isapparent that the operations of erecting andtaking downthe'form may be easily and quicklyperformedand. that material of which theform isconstructed will be dam aged' but-slightly,-if at all, in either operat1on..

Having thus described my invention, what I claim as new therein and by Letters-Patent is 1. A clamp, for concrete forms comprising desire to secure for supporting said clamp from above, a two having end portions projecting beyond the mounted on the hangers and adapted for adjustable connection with the base bar.

2. A clamp for concrete forms comprising hanger bars having ears at their upper ends bar having split ends through which the .hanger bars are projected andprovide'd with and pins projecting through apertures in. the base barto keep the hangerba'rs.

3. A clamp for concrete forms comprising hanger bars having ears at their upper ends for supporting said clamp from above and 'bar having split ends through which'the hanger bars are projected and provided with apertures, pins projecting through apertures in the hanger bars to support the basebar, pins projecting. through apertures in the base bar to keep the hanger bars, and levers for tightening the hanger bars against a form. i 4. The combination with adjustable comprising levers pivotally connected with connected with each hanger bar, an arm pivotally connected with each lever, a yoke pivotally connected with each of said arms and inclosing a portion of the base bar, and a bolt extending through each yoke and limiting the open space between the memthe purpose set forth.

In testimony whereof I affix my signature in presence. of two witnesses;

ARTHUR H. ,SYMONS.

'- Witnesses:

MYRTLE M. JAoKsoN',

hanger bars having ears at their upper ends ARTHUR W'. Cars.

piece base bar carried by the hanger bars and hangers,v and tightening" levers pivotally for supporting said clamp from above and having apertures in their lower ends, a base apertures, pins projecting through apertures in the hanger bars to support the base bar,

the hanger bars, yokes slidably mounted on. the base bars, and arms having plvotal conhanger bars, a base bar, a lever pivotally having apertures in their lower ends, ab'ase hanger and base bars, of tightening levers I bers ofsaid yoke, substantially as and for 

